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发明名称
Annulus safety valve
摘要
申请公布号
GB2248256(B)
申请公布日期
1994.09.28
申请号
GB19910018326
申请日期
1991.08.27
申请人
* BAKER HUGHES INCORPORATED
发明人
SCOTT CLAYTON * STRATTAN;THOMAS M * DEATON
分类号
E21B34/10;(IPC1-7):E21B34/10
主分类号
E21B34/10
代理机构
代理人
主权项
地址
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